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首页> 外文期刊>Plant and Soil >Estimation of autotrophic and heterotrophic components of soil respiration by trenching is sensitive to corrections for root decomposition and changes in soil water content
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Estimation of autotrophic and heterotrophic components of soil respiration by trenching is sensitive to corrections for root decomposition and changes in soil water content

机译：通过挖沟估算土壤呼吸的自养和异养成分对根分解和土壤水分变化的校正很敏感。

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摘要

This study aims to assess the effects of corrections for disturbances such as an increased amount of dead roots and an increase in volumetric soil water content on the calculation of soil CO2 efflux partitioning. Soil CO2 efflux, soil temperature and superficial soil water content were monitored in two young beech sites (H1 and H2) during a trenching experiment. Trenching induced a significant input of dead root mass that participated in soil CO2 efflux and reduced the soil dissolved organic carbon content, while it increased superficial soil water content within the trenched plot. Annual soil CO2 efflux in control plots was 528 g C m?2 year?1 at H1 and 527 g C m?2 year?1 at H2. The annual soil CO2 efflux in trenched plots was 353 g C m?2 year?1 at H1 and 425 g C m?2 year?1 at H2. By taking into account annual CO2 efflux from decaying trenched roots, the autotrophic contribution to total soil CO2 efflux reached 69% at H1 and 54% at H2. The partitioning calculation was highly sensitive to the initial root mass estimated within the trenched plots. Uncertainties in the remaining root mass, the fraction of root C that is incorporated into soil organic matter during root decomposition, and the root decomposition rate constant had a limited impact on the partitioning calculation. Corrections for differences in superficial soil water content had a significant impact on annual respired CO2 despite a limited effect on partitioning.
机译：这项研究旨在评估校正诸如死根增加和土壤水体积体积增加等干扰对土壤CO2 外排分配计算的影响。在挖沟试验中，监测了两个年轻山毛榉站点（H1和H2）的土壤CO2排放，土壤温度和表层土壤水分。沟引起大量死根输入，参与土壤CO2的外排，降低了土壤溶解有机碳的含量，但增加了沟渠内表层土壤的水分含量。对照样地的年土壤CO2 外排量在H1为528 g C m？2 year？1 ，在H1为527 g C m？2 year？1 。 H2。 ed沟地块的年土壤CO2 外排量在H1为353 g C m？2 year？1 ，而在425 g C m？2 year？1 在H2。考虑到腐烂的开沟根每年产生的CO2 外排量，自养对土壤总​​CO2 外排量的贡献在H1达到了69％，在H2达到了54％。分区计算对沟槽图中估计的初始根质量高度敏感。剩余根质量，根分解过程中掺入土壤有机质中的根C含量以及根分解速率常数的不确定性对分区计算的影响有限。尽管对分区的影响有限，但对表层土壤含水量差异的校正对年度呼吸的二氧化碳影响很大。

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